21223104 has 56 divisors (see below), whose sum is σ = 64178688. Its totient is φ = 6063360.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223104 is 40132212.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6552 + ... + 9239.

It is an arithmetic number, because the mean of its divisors is an integer number (1146048).

Almost surely, 2^21223104 is an apocalyptic number.

21223104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21223104 is an abundant number, since it is smaller than the sum of its proper divisors (42955584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223104 is a wasteful number, since it uses less digits than its factorization.

21223104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15813 (or 15803 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21223104 is about 4606.8540241688. The cubic root of 21223104 is about 276.8660049528.

Adding to 21223104 its reverse (40132212), we get a palindrome (61355316).

The spelling of 21223104 in words is "twenty-one million, two hundred twenty-three thousand, one hundred four".